Stick-on Four Button USB MIDI Controller
Sometimes your gear really needs a few MIDI control buttons strategically located. Now you can stick them on. https://github.com/gdsports/buttons4
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Build a MIDI button controller from a QWERTY USB keyboard
The sketch demonstrates how to send MIDI messages such as Note On/Off, Program Change, and System Exclusive messages. The source code and instructions are here. https://github.com/gdsports/USBHIDKbd2MIDI